ST16C450

UART with Higher Operating Speed and Lower Access Time
Data Sheets OBS (Obsolete)

Overview

Information UART with Higher Operating Speed and Lower Access Time
Data Bus Interface Intel
# of Channels 1
Max Data Rate 5V (Mbps) 1.5
Max Data Rate 3.3V (Mbps) 0.5
Max Data Rate 2.5V (Mbps) na
Max Data Rate 1.8V (Mbps) na
Tx FIFO (Bytes) 1
Rx FIFO (Bytes) 1
Auto Flow Control
Auto RS-485 Half-Duplex Control
Multidrop (9-bit) Mode
Fractional Baud Rate Generator
Power Down Mode
Supply Voltage Range VCC (V) 2.97 to 5.5
Auto RTS/CTS
Package PDIP-40, PLCC-44, TQFP-48
FIFO Level Counters
Selectable/ Programable Trigger Levels
IrDA Sup
5V Tolerant Inputs
Max UART/GPIO Input Voltage (V) VCC
Max UART/GPIO Output Voltage (V) VCC
Temperature Range (°C) -40 to 85
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The ST16C450 is a universal asynchronous receiver and transmitter. The ST16C450 is an improved version of the NS16450 UART with higher operating speed and lower access time. A programmable baud rate generator is provided to select transmit and receive clock rates from 50 bps to 1.5 Mbps.

The ST16C450 on board status registers provides the error conditions, type and status of the transfer operation being performed. Included is complete MODEM control capability, and a processor interrupt system that may be software tailored to the user’s requirements. The ST16C450 provides internal loop- back capability for on board diagnostic testing.

The ST16C450 is available in 40 pin PDIP, 44 pin PLCC, and 48 pin TQFP packages. It is fabricated in an advanced CMOS process to achieve low drain power and high speed requirements.


  • Pin to pin and functionally compatible to the Industry Standard 16450
  • 1.5 Mbps transmit/receive operation (24MHz)
  • Programmable word lengths (5, 6, 7, 8)
  • Even, odd, force, or no parity generation and detection
  • Independent transmit and receive control
  • Standard modem interface
  • Low operating current ( 1.2mA typ.)
  • Pb-Free, RoHS Compliant Versions Offered

  • Battery Operated Electronics
  • Internet Appliances
  • Handheld Terminal
  • Personal Digital Assistants
  • Cellular Phones DataPort

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets ST16C450 UART 4.2.0 September 2003 182.1 KB
Application Notes DAN-108, UART Crystal Oscillator Design Guide 1.0.0 March 2000 218.1 KB
Application Notes DAN-107, Interfacing 16Cxxx UARTs to a CPU 1.0.0 August 1999 32.4 KB
Application Notes General UART Application Note 1.0.0 December 1996 39.8 KB
Application Notes AN-450/AN-550, ST16C450/550 Application Example 1.0.0 December 1996 44.2 KB
User Guides & Manuals Evaluation Board User's Manual 1.3.0 July 2003 29.5 KB
Product Brochures Interface Brochure November 2023 3.7 MB
Schematics & Design Files ISA Eval Board Schematic 1.4.0 August 2007 77.6 KB
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Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement PDN
ST16C450CJ44-F PLCC44 0 70 OBS ST16C550CJ44-F
ST16C450CJ44TR-F PLCC44 0 70 OBS
ST16C450CP40 PDIP40 0 70 OBS ST16C450CP40-F
ST16C450CP40-F PDIP40 0 70 OBS ST16C450CJ44-F , ST16C450CQ48-F
ST16C450CQ48-F TQFP48 0 70 OBS ST16C550CQ48-F
ST16C450CQ48TR-F TQFP48 -40 85 OBS ST16C550CQ48TR-F
ST16C450IJ44-F PLCC44 -40 85 OBS ST16C550IJ44-F
ST16C450IJ44TR-F PLCC44 -40 85 OBS ST16C550IJ44-F
ST16C450IP40 PDIP40 -40 85 OBS ST16C450IP40-F
ST16C450IP40-F PDIP40 -40 85 OBS ST16C450IJ44-F , ST16C450IQ48-F
ST16C450IQ48-F TQFP48 -40 85 OBS ST16C550IQ48-F
ST16C450IQ48TR-F TQFP48 -40 85 OBS
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Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.

Packaging

Pkg Code Details Quantities Dimensions PDF
PDIP40
  • JEDEC Reference: MS-011
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 50.0ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: n/a
  • Quantity per Tube: 9
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): n/a
  • Tape & Reel Unit Orientation: n/a
  • Dimensions: inch
  • Length: 2.100 max.
  • Width: 0.580 max.
  • Thickness: 0.195 max.
  • Lead Pitch: 0.100
PLCC44
  • JEDEC Reference: MS-018
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 38.0ºC/W
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 27
  • Quantity per Reel: 500
  • Quantity per Tube: 27
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 32 x 24
  • Tape & Reel Unit Orientation: Pin 1 at sprocket hole.
  • Dimensions: mm
  • Length: 16.585
  • Width: 16.585
  • Thickness: 4.57
  • Lead Pitch: 1.27
TQFP48
  • JEDEC Reference: MO-026
  • MSL Pb-Free: L3 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 59.0ºC/W
  • Bulk Pack Style: Tray
  • Quantity per Bulk Pack: 250
  • Quantity per Reel: 1500
  • Quantity per Tube: n/a
  • Quantity per Tray: 250
  • Reel Size (Dia. x Width x Pitch): 330 x 16 x 12
  • Tape & Reel Unit Orientation: Quadrant 2
  • Dimensions: mm
  • Length: 7.0
  • Width: 7.0
  • Thickness: 1.2
  • Lead Pitch: 0.5

Notifications

Distribution Date Description File
07/12/2017 Product Discontinuation Notice
07/11/2017 Product Discontinuation Notification
08/17/2016 Qualification of ANST as an alternate manufacturing site.
11/05/2015 Updated information subsequent to original published PCN 13-0834-03 on 04/02/2014. ASE Malaysia as alternate assembly site Addition of qualified alternate assembly site of 28, 44, 68L PLCC packaged products.
07/18/2014 Elimination of back mark. Eliminate back mark; consolidate information in top mark.
04/02/2014 Qualification of ASE Malaysia for assembly of 28, 44, 68L PLCC packaged products. Alternate assembly site.
10/03/2013 Product Discontinuation Notification Discontinued.
10/03/2013 Addition of an alternate qualified assembly site, ASE Chung-Li (Taiwan). Material change and alternate assembly site.
10/17/2012 Exar has qualified Millennium Microtech/Thailand as an alternate assembly supplier for 28, 44 and 68 lead PLCC packages in addition to the existing supplier, Unisem/Indonesia. Capacity enhancement
04/11/2011 Product Discontinuation Notice In support of “green” initiatives, the listed leaded part numbers will be discontinued by Exar.

FAQs & Support

Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
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LSR bit-6 is a superset of LSR bit-5. The transmitter consists of a TX FIFO (or THR only when FIFOs are not enabled) and a Transmit Shift Register (TSR). When LSR bit-5 is set, it indicates that the TX FIFO (or THR) is empty, however there may be data in the TSR. When LSR bit-6 is set, it indicates that the transmitter (TX FIFO + TSR) is completely empty.

You can tell by reading LSR bit-5 or bit-6. If they are '0', then the transmit interrupt was generated by the trigger level. If they are '1', then the transmit interrupt was generated by the TX FIFO becoming empty. For enhanced UARTs, you can just read the FIFO level counters.

An RX Data Ready interrupt is generated when the number of bytes in the RX FIFO has reached the RX trigger level. An RX Data Timeout interrupt is generated when the RX input has been idle for 4 character + 12 bits time.

For some UARTs, the RX Data Timeout interrupt has a higher priority and in others, the RX Data Ready interrupt has a higher priority. See the interrupt priority section of the datasheet.

The UART requires a clock and a valid baud rate in order to transmit and receive data. Check that there is a clock signal on the XTAL1 input pin. Also, valid divisors need to be written into the DLL and DLM registers. Most UARTs have random (invalid) values upon power-up.

For most UARTs, the interrupt is generated when the data is ready to be read from the RX FIFO. The are some UARTs that generate the interrupt when the character with the error is received. There are some UARTs that have a register bit to select whether the LSR interrupt is generated immediately or delayed until it is ready to be read.

The UART will enter the sleep mode if the following conditions have been satisfied for all channels:
 
-Sleep Mode is enabled
-No interrupts are pending
-TX and RX FIFOs are empty
-RX input pin is idling HIGH (LOW in IR mode)
-Valid values in DLL and DLM registers
-Modem input pins are idle (MSR bits 3-0=0x0)
 
See AN204, UART Sleep Mode for more information on UART Sleep Mode

The UART will wake-up from sleep mode by any of the following conditions on any channel:
 
-Sleep mode is disabled
-Interrupt is generated
-Data is written into THR
-There is activity on the RX input pin
-There is activity on the modem input pins
 
If the sleep mode is still enabled and all wake-up conditions have been cleared, it will return to the sleep mode.
 
See AN204, UART Sleep Mode for more information on UART Sleep Mode 

There will be no activity on the XTAL2 output.
 
See AN204, UART Sleep Mode for more information on UART Sleep Mode 

For any UART that has the wake-up indicator interrupt, an interrupt will be generated when the UART wakes up even if no other interrupts are enabled.
 
See AN204, UART Sleep Mode for more information on UART Sleep Mode 

No, Auto RTS and Auto CTS are independent. Auto RTS is toggled by the UART receiver. Auto CTS is monitored by the UART Transmitter.

No, Auto RTS and Auto CTS will work normally without the interrupts enabled.

No, software flow control characters are not loaded into the RX FIFO.

Since 2-character software flow control requires that 2 consecutive flow control characters match before data transmission is stopped or resumes, there is less of a chance that data transmission is stopped because one data byte matched a control character.

Auto RS485 Half-Duplex Control feature overrides the Auto RTS flow control feature if both features use the RTS# output pin. Both features can only be used simultaneously if the Auto RS485 control output is not the RTS# output. For some UARTs, the Auto RS485 control output is not the RTS# output.

Most UARTs use RTS#, however the XR16C850 and XR16C864 use the OP1# output as the Auto RS485 control output. In addition to using the RTS# output as the Auto RS485 control output, the XR16L784, XR16L788 and XR16V798 can use the DTR# output as the Auto RS485 control output.

The polarity of the RS485 control output varies from one UART to another. For some UARTs, an inverter may be required. Some of the newer UARTs have register bits that can change that polarity of the RS485 control output.

In the normal mode, the TX interrupt is generated when the TX FIFO is empty, and there may still be data in the Transmit Shift Register. In the RS485 mode, the TX interrupt is generated when the TX FIFO and the TSR register are both empty.

It is recommended that the FIFO counters at the Scratchpad Register location be used. When transmitting or receiving data, writing to the LCR register could result in transmit and/or receive data errors.

Due to the dynamic nature of the FIFO counters, it is recommended that the FIFO counter registers be read until consecutive reads return the same value.

All of the UARTs that have the IR mode supports up to 115.2Kbps as specified in IrDA 1.0. The newer I2C/SPI UARTs can support up to 1.152Mbps as specified in IrDA 1.1.

For external clock frequencies above 24MHz at the XTAL1 input, a 2K pull-up may be necessary to improve the rise times if there are data transmission errors.

Yes, you can daisy-chain it like that, but only up to 2 times (3 UARTs total in the daisy-chain). The UARTs should be as close as possible.

No, it just has to meet the minimum high and low pulse widths.

Yes, if you are using a UART with a fractional baud rate generator. This provides a divisor feature with a granularity of 1/16, allowing for any baud rate to be generated by any clock frequency, standard or non-standard. Click on the parametric search button of the product family page and find the Fractional Baud Rate Generator column which tells which products have this feature.

They crystal oscillator circuitry is recommended for fundamental frequency crystals only. The maximum frequency for crystals with fundamental frequencies is typically 24MHz. Above that frequency, crystals operate at higher harmonics, which will not work with the recommended crystal oscillator circuitry.

No. It is only required for transmitting and receiving data.

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It depends on the baud rate. For example, for a start bit, 8 data bits, no stop bit and 1 stop bit, the maximum baud rate deviation is 4.76%. For more information, see https://www.exar.com/appnote/dan108.pdf

Please check that all the following conditions are satisfied first.

 

  • no interrupts pending (ISR bit-0 = 1)
  • modem inputs are not toggling (MSR bits 0-3 = 0)
  • RX input pin is idling HIGH • divisor (the value in DLL register) is non-zero
  • TX and RX FIFOs are empty

 

Be sure sleep mode bit has been set to 1. If there are multiple UART channels, the sleep conditions must be true for all channels.

 

See more on Sleep Mode in AN204 UART Sleep Mode.

Yes. Note: some devices do have powersave mode. If UART goes into powersave mode, then the registers are not accessible.

 

See more on Sleep Mode in AN204 UART Sleep Mode.

Read LSR register to check whether the UART receives the data or not.

 

  • If LSR value is 0x60, it means that either UART receiver FIFO doesn’t receive the data or the data in receiver FIFO has been read out before the read of LSR.
  • If LSR value is 0x00, it means data is still in the THR (clock doesn’t oscillate to transmit data).
  • If LSR value is 0xFF, it means either UART is in powersave mode or UART is powered off. For those devices with powersave mode, be sure that UARTS are not in powersave mode.

 

 

See more on Sleep Mode in AN204 UART Sleep Mode.

 

  • Check whether the register set can be accessed.
  • Check whether the crystal is oscillating fully.
  • Check whether the data can be transmitted in internal loopback mode.

 

 

See more on Sleep Mode in AN204 UART Sleep Mode.